These enormous boulders are scattered over a vast area. The hypothesis regarding their possible natural origin does not hold much water, just see the last photo, that illustrates how these particular stones erode naturally. Yet, we are offered to believe that they erode by forming polygonal stone masonry and jumping on the top of each other.
On the other hand the stones look exactly some other ruins of cyclopean megaliths (listed in the category), which are MOST DEFINITELY of intelligent design.
So the origins of these stone is still pretty much an opened question as of today. The strange straight cuttings on some of them also don't have much of natural feel...

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scattered across a wide, shallow valley, 95 kilometres south of Tennant Creek